Hackers shut down both the Tel Aviv Stock Exchange (TASE) and El Al’s respective websites on Monday, one day after a hacker network threatened to carry out attacks on both sites.

The network, which goes by the name “nightmare group,” was able to cause severe problems for both sites. By 10 A.M., TASE’s website was only partially functioning, while El Al’s website did not function at all.

The hack comes in the wake of a series of cyber attacks over the past two weeks, and only a day after Hamas called for harsher hacking attempts against Israeli websites.